Among $Al_2O_3$,$SiO_2$,$P_2O_3$,and $SO_2$,the correct order of acidic strength is:
- A$Al_2O_3 < SiO_2 < SO_2 < P_2O_3$
- B$SiO_2 < SO_2 < Al_2O_3 < P_2O_3$
- C$SO_2 < P_2O_3 < SiO_2 < Al_2O_3$
- D$Al_2O_3 < SiO_2 < P_2O_3 < SO_2$
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